Unless you have spent time in Phoenix you have no idea how hot it gets.The asphalt temp will be 150 degrees or more in the summer making it hard to keep any car running cool.I worked for Lou Grubb Chevrolet for many years in the mid/late 80s and I worked on some corvettes and them things run 255 degrees in mid summer and there is nothing you can do about it. Its really bad driving in rush hour bumper to bumper traffic when its 105 outside. Good luck!
Steve